Electric-resistance device.



W. S. HADAWAY, JB. ELECTRIC RESISTANCE DEVICE.

APPLICATION FILED Nov. zo, 1911.

, 94,851. Patented Apr. 28, 1914.

Y l @MEMBRI sTATns PATENT OFFICE- WILLIAM S. HADAWAY, JR., 0F NEW YORK,N. Y.

ELECTBIC-BESISTNCE DEVICE.

Specicatio of Letters Patent.

Patented Apr. 28, 1914.

Application mea november 2o, 1911. serial No. 661,204.

To all 'whom 'it may concern.'

Be it known'that I, WILLIAM S. HADAWAY, J r., a citizen of the UnitedStates, residing at New York, in thescounty of New York and State of NewYork, have invented new and useful Improvements in Electric-ResistanceDevices, of which the following is a full, clear, concise, and exactdescription, reference being had` to the accompanying drawing, forming apart of this specifica-4 which my invention may assume in practice.

My invention, however, is not limited to this forml but may assume otherforms.

In the views of these drawings z-Figure 1 shows a side elevation of oneform of heater. Fig. 2 shows a side elevation of one of the heatingunitsxwith a portion of the casing broken away. Fig. 3 shows a sectionalview on line 33 of Fig. 2. Fig. 4 shows a sectional view on line a-#I ofFig. 3.

In the construction used for Vpurposes of illustration, I have shown aplurality of heating units l having their ends attached to suitable rodsor bolts 2;.the heating units l, of a construction hereinafterdescribed, being arranged in series and provided with terminal clips 3,arranged to receive the ends of suitable conductors. p

The heating units 1 are in a preferred form constructed as shown in Fig.2, vwherein a slotted resistance material 4 is inclosed between sheetsof insulation 5. If desired, 'I may use mica as this insulation. Thesheets of insulation and the inclosed resistance material are in turninclosed within an vouter channel member 6, preferably formed of stampedsheet metal, and a top plate 7 preferably of the' same material, isplaced over the same. The parts are preferably held together andcompressed by bending over the edges 8 ofthe channel 6 ii order to clampthe same snugly upon the p ate 7 The units l are preferably attached tothe standards or rods 2 in such a manner as to form a frame. In apreferred form, the ends of the channels 6 and the top plates 'i' areprovided with extensions 9 and 10 as shown in Fig. 1 which are in theform of shoulders. These shoulders are preferably provided withperforations through which the frame rods 2 may be passed and, in apreferredform, the adjacentv units are separated or spaced from eachother by one or more sleeves l1 which inclose the frame rods 2. Thecircuit connections for the units may obviously be arranged in variousdifferent. ways so that the units may be connectedeither in series orparallel, if desired, and any number ofunits may be used.

In` the construction shown in Fig. l, I have illustrated the resistanceunits 1 arranged in series, a compressible terminal clip 3 beingattached to each of the outside units and arranged to receive the end ofa suitable lead. In order that such a, connection may be made, Ipreferably provide each strip of resistance material 4L with an integralunslotted extension 12 at each of its ends. If. desired, however, thismay be a separate strip held in position by the clamping of the parts orotherwise. This extension 12 preferably is narrower than the body of thestrip and is preferably passed through a suitable slot 13 in the sheetsof insulation 5 and then passed through a larger slot 14 in the topplate 7. Obviously the construction and arrangement of these slots maybe varied if desired. After passing through jacent extensions 12 arepreferably brought' together on insulating washers 15 carried upon therods 2. In a preferred form, these washers 15 are made in two parts asshown in Fig. 3 so that the ends lof the resistance material may beperforated and fitted over the ends of the same as therein shown, andthat a snug contact may be made between the ends, These washers,however, may be of any desired construction. The washers are alsopreferably spaced between the extensions 9 and l0 on the casings `1 bycertain of the sleeves similar to the sleeves 11 which in this case areshorter than the sleeves spacing apart the opposite ends of the sameunits. In the series arrangement of units shown for purposes ofillustration, it is obvious that a conductor may be connected to theupper end of the left hand unit and that the other conductor may be'connected to the upper end of the right hand unit, although' the mannerof connecting these various units may be varied. In a preferred form,the units, their spacing means and their'electrical connections are heldsnugly together on the rods 2 by .suitable taps 16.

If desired, the'rods and the resistance units or heating units carriedbetween them may be mounted in any suitable support so that the devicemay be used either as a heating means, as, .for instance, a radiator, oras an electric resistance unit. Due-to the large heat radiating capacityof the several units, a very effective radiator may be provided. On theother hand, the units possess a high resistance which well adapts themto use as resistance elements for controlling or other purposes.

- By my improved construction and arrangement of the heat-ing units, Ihave provided an exceedingly simple and convenient means for connectingand assembling the units in gang form. The electrical connecting partsare effectually insulated so that there is no danger of shortcircuit-ing. Further, the parts are so attached to each other that thewhole device is exceedingly sturdyr and well adapted to withstand longuse in service. Further, the construction is an exceedingly simple onewhich may be readily manufactured and assembled at small expense.

While I have in this application described one specific form which myinvention may `4assume in practice I do not wish to be limited to thisspecific form, chosen for purposes of illustration, but wish rather toinclude within the scope of this application all of those forms of myinvention falling within its spirit.

What I claim as new and desire to secure by Letters Patent'is l. In anelectric'resistance unit, a casing having slots in its opposite ends andon opposite sides thereof, and a strip of resistance material inclosedtherein and insulated therefrom, said strip having-extensions protrudingthrough said slots and insulated from the walls thereof.

2. In an electric resistance unit, a strip of slotted resistancematerial having an integral extension of reduced width disposed at rightangles to the slots therein, a plurality of sheets of insulationinclosing the same, one of said sheets having a slot in its end throughwhich said extension protrudes,

y and a casing member having a slot therein opposite the slot in saidsheet of insulation. 3. In an electric resistance unit, a strip ofslotted resistance material having an integral extension of reducedwidth disposed at right angles to the slots therein, a plurality ofsheets of insulation inclosing the same, one of said sheets having aslot in its end through which said extension protrudes,

and a casing member having a slot therein opposite the slot in saidsheet of insulation but'of greater width and length.

4. In an electric unit, ay metallic casing having slots in its oppositeends, sheets of insulation inclosed in said casing, said sheets havingslots/fof smaller size opposite the slots in said casing, and aresistance material inclosed between said sheets of insulation andhaving extensions protruding through the slots in said insulatingmaterial and said casing.

5. In an electric resistance unit, a metallic casing having perforatedlugs on its ends and transversely disposed slots in opposite sides ofthe same near its opposite ends, and a resistance material inclosed insaid casing and insulated therefrom, said resistance material havingperforated extensions protruding through the slots in said casing and aplurality of supporting members extending through the perforations insaid lugs and said extensions.

6. In an electric resistance unit, a metallic casing comprising achannel member and a holding plate held in position thereon bytheroverturned side members of said channel member, said channel memberand holding plate being provided on their opposite ends with integralprojections, a sheet of resistance material inclosed in said casing, andsheets of insulation therefor, said sheets of resistance material and ofinsulating material being of less length than the channel and holdingplate and the integral projections on the latter beingcompressed uponeach other.

7. In an electric resistance unit, a plurality of boxed grids disposedin parallel relation, a plurality of strips of resistance materialinclosed therein having their ends protruding through openings in thesides Y thereof, a plurality of supporting members extending throughopenings in the ends of said grids,'and terminal members for said gridscarried upon' said supports between the grids and each connectedto theprotruding ends of the resistance material of two adjacent grids.

8. In an electric resistance unit, a plurality of metallic casingshaving openings in their ends and slots therein intermediate their endsand on opposite sides thereof, a plurality of strips of resistancematerial inclosed in said casings `and insulated therefrom, said stripsof resistance material having extensions protruding through said slots,supporting rods protruding through the openings in said casings andfixed to the incassi latter, and terminal members carried on said rodsclamping together. the adjacent ends of said resistance material.

9. In an electric resistance unit,- a plurality of rigid metalliccasings having slots in their opposite sides and at their opposite ends,a plurality of strips of insulating material inclosed in said casingsand having slots therein opposite the slots in said casings but ofsmaller size, a plurality of strips of resistance material inclosedbetween said sheets of insulation and having portions thereofprotrudinfr` through said slots, a plurality of paraIlei supportsextending through openings in the ends of said casings adjacent saidslots, and a plurality oit terminal members carried on said supportsbetween said casings, said terminal members connecting the adjacent endsof 'the resistance material protruding from said slots.

10. In an electric resistance unit, a plurality of threaded rods, aplurality of rigid casings disposed at right angles with respect theretoand spaced apart from each other,

said casings having openings in their ends through which said rodsextend, strips of resistance material inclosed in said casings andinsulated therefrom, said strips of resistance material havingextensions protruding from said casings at opposite ends of the same,separable clamping collars carried on said rods forl clamping togetheradjacent ends of said strips of resistance material, means for spacingsaid clamping collars from the ends of said casings, means for spacingsaid casings from each other, and means for holding the parts togetherto form a rigid unitaryv frame.

4In Witness whereof, I have hereunto subscribed my name in the presenceof two Witnesses.

WILLIAM S. HADAWAY, JR.

Witnesses: i

GEORGE J. MALLON, Y CHARLES W. STEPHENS.

